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project-api-validation SKILL.md skillA

project-api-validation from seonaru/nulnul-harness is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned
mdr add seonaru/nulnul-harness/project-api-validation@git:20260902.749d57b

Pins git:20260902.749d57b in mdr.lock. Pin the fingerprint instead.

Audit grade
A, 17 of 17 checks passed
Kind
SKILL.md skill
Repository
seonaru/nulnul-harness
Path
evals/experiment14/fixtures/direct/.agents/skills/project-api-validation/SKILL.md
Versions recorded
1
Latest version
git:20260902.749d57b, committed Sep 2, 2026
Size
299 bytes
Repository stars
34
License
MIT

Preserve this project's request validation and error catalog.

Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.

What the file says

# Project API validation

Reject invalid request values before side effects, preserve the project error
envelope, update the error catalog for new codes, and run the API contract check.

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint
mdr add seonaru/nulnul-harness/project-api-validation@sha256:5a90f150b2506ca2

The line at the top of this page pins the label git:20260902.749d57b, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.

Badge

mdr badge

[![mdr](https://markdownregistry.com/badge/art_ytdohoj3vkzlbil2.svg)](https://markdownregistry.com/a/art_ytdohoj3vkzlbil2)

3 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 1 version of this file, committed on Sep 2, 2026.

versioncommittedcommitsizeaudit
git:20260902.749d57b latest2026-09-02 749d57b 299 BA view

Audit of the latest version

A  17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.
  • pass: Frontmatter block present
  • pass: Frontmatter declares a name
  • pass: Frontmatter declares a description
  • pass: Size between 200 bytes and 200 KB (299 bytes)
  • pass: No zero-width or bidi control characters
  • pass: No instruction hidden inside an HTML comment
  • pass: No link to an exfiltration or paste host
  • pass: No credential-shaped string
  • pass: No instruction to send local credentials anywhere
  • pass: No text hidden with inline styles
  • pass: No prompt-injection phrasing
  • pass: No curl or wget piped into a shell
  • pass: No recursive delete of root, home or parent
  • pass: No instruction to read or print local credentials
  • pass: No base64 blob over 200 characters
  • pass: No link to a raw IP address
  • pass: No script tag

Source

GitHub

seonaru/nulnul-harness · 34 stars · license MIT · pushed 2026-09-10 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_ytdohoj3vkzlbil2
GET https://markdownregistry.com/api/v1/resolve?ref=seonaru/nulnul-harness/project-api-validation
GET https://markdownregistry.com/api/v1/blob/5a90f150b2506ca27f9ceb3e4801cb5a703cded281d7a813c55b273040266692

Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.

Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.

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Every file in seonaru/nulnul-harness

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git:20260902.749d57b · audit A · 34 stars
project-api-validation SKILL.md skill
seonaru/nulnul-harness · evals/final-pack-foundation-repair-live-proof/fixtures/direct/.agents/skills/project-api-validation/SKILL.md · Apply this repository's request-validation and structured error-catalog contract when public API acceptance or…
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